Glass-drawing apparatus.



J. H. LUBBERS. GLASS DRAWING APPARATUS. APPLIGATIOI? FILED MAR. 17, 1906. 914,588, Patented Mar. 9, 1909.

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I H. LUBBBRS.

cuss nmwme APPARATUS.

APPLIUATIDH TILED 1 .13.17, 1908- Patented Mar. 9, 1909. 2 burrs-sum a INVENTPR 2' 1 47Mmt fl/ Ll-J WITNESSES ..\llegheny, Allegheny county,

was COMPANY, or rtrrseene, Pt-INNSYLVA FATE) T l 1 l 3E.

NIA, A CORPORATION t)! NEW .ll'ilthlui GLASS-DRAWING APPARATUS.

No. 914,588. Specification of Application tlled Mfllflh 17,

To all whom it may concern:,

lie it known that I. JOHN H. Lt'nniuis. of Pennsylvania. ha re invented a new and useful Glassdh'aiw ing Apparatus, of which the following is a lull, clear. and exact description. reference being had to the accompanying drawings, forming part of this specificatioinin Wl'liCl1- Figure l is a front elevation of a drawing llitliit constructed in accordance with my invention; Fig. 2 is a top plan view of the same; Fig. 3 1s a vertical cro-=s-secti0n Fig. at is a diagrammatic view showing the forming of the glass into the cylinder during the draw; and Figs. 5 and ti are cross sec tions of the cylinder looking downwardly showing clitlerent adjustmentwbetween the drawing iraiue and the glass receptacle.

Lily lti'\t?lillt)1l relates to glass drawing mechanism wherein the article. \vhether hollow or otherwise. is drawn upwardly from a bath of molten glass. in such drawing operations, it has been found diliicult to make the glass of the same thickness in the different portions of the cirnnniercnce of the hollow article, or ditl'crent. parts of the plate, it a plate or sheet is being drawn. The glass thus drawn is often of the thick and thin variety. This forming of thick and thin portions during the drawing operation i not only objectionable on account of the variation in thickness; but it causes a large amount of breakage both during the drawin and the subsequent trtattmcnt. It also injures the qualit of the glass lirinaking it very diiiicult to flatten pi-operiv. where -ylinders are formed, produces waste in cutlllllI. and sometimes prevents cuttina; the glass in the desired way.

I have found that where the J 'lit?-' is led into a receptacle, for example. a refractory pot. the glass may be of a ditlercnt temperature and stitl'ness in one portion of the pot. from that. in another portion; and the heat. of the pot may vary in dili'erent parts thereof. There may also be variations in the character of the. pot material in ditferent portions of its walls, and other causes also lead to a ditlerence in the surface tension in different; parts of the article being drawn. I have found that, by adjusting the pot and drawing mechanism relatively to each other, I can reduce and avoid these difiiculties to a large extent. Nith proper Letters Patent. Patented March 9, 1909.

1906. Serial No. 306.522.

''care in the adjusting. l can practicaltr eliminate thick and thin glass and its consequent dillieulties and Objflt'ftlOUS. The inn portaiice of this will be understood when it is considered that in changing shifts of lncn all of the conditions surrounding the feed ing' of glass into the pot and the drawi n; operations are changed. These operations still depend to a considerable extent on the skill and familiarity of the workmen. For exam to, if the glass is ladled from the tank into tie drawing pots-1, one operator may bc-- come accustomed to ladlinp; the glass from a portion of the bath which is at a certain distance from the wall of the tank. llis successor on the next shift may be accustomed to ladling from a dtl'erent point in u (litl'crcut manner and under other condi tions. For these reasons, it has been found that where the drawing was proceeding in the proper manner with one ladler, it might draw in an entirely ditlerent manner with the next ladlcr. For some time it was not understood what caused this ditiercncc which led to such important variations in the drawing of the glass. 1 hareioun-i that by adjusting the pot and drawing tool or hail relativetr to each other in a lateral direction. 1 can to a large degree compensate for these differences owing to individual peculiarities in the workmen. and with proper care can practically eliminate llll'lClt and thin glass. Similarly. I can orereonnthe troubles arising from variations in thc heat conditions and material of the pot.

In he drawing. referring to Figs. 1, 2 and ii. I show a drawing cage consisting of a rectangular frame having side bars 2. 3- and top and bottom rails 3 and 4. The frame is provided with guides 5 moving over the vertical guide-bars t1, and the frame may lac raised through any suit-able connections such as the cable 7. At the center of the frame is avertical bar or support 8, from which projects forwardly the book 9, on which the blow-pipe i0 is hung; This hook 9 is forked to receive the projections on the blow-pi e, which at its lower end rests witl 'n the s ot in the guide 11.

12 is an intermediate spring which bears. against the intermediate part of the blow pipe.

The vertical c ntral bar 8 is supported o' two arms 13 and 14, of which the upper mn Y 45 understood.

consist of a rearwardly bent extension of the bar itself as shown. Th vided with screw-threaded stems which can tend through horizontally slotted holes in a the drawing frame and are held by the adjusting nuts 15. It is evident that by loosenmg the adjusting nuts the blow-pipe carrier mayt be moved across the frame; and by shi ing the position of the adjusting nuts the blow-pipe may be moved toward or from the plane of the cage. I thus obtain two horizontal adjustments at right angles to each other by which I can bring the blowpipe or bait to an desiredlpositlon relative to the walls of t e pot. f on starti shift it is found that the lass is draw thick and thin upon a potfi loosen the u ing screws for the bloy-pipe sa port of pet and shift the'poltion of e blow: pipe to compensate for the diflermg con,- itio'ns of tension at the Hiflerent parts of the surface of the .bath. For example, if the glass is of a lower temperature at one side of the bath than at the opposite side, the blow-pi will be moved toward the hot ter side. 'I h e cooler and stiller portion of the glass will have a greater surface tension than the hotter portion, and consequently. by moving the blow-pipe toward the hotter pertion I can compensate for this difl'erence in the condition. Similarly, wall of the pot is hotter on one side than the other, thus giving more heat tothe glass, I move the bait correspondingly. It is found M in practice that by adjusting the sition of he bait or blow-pipe relative to t e walls of tLB pot the difficulties in drawing thick and thin glass are practically overcome. In practice this adjustment maybe needld when 40 a shift is changed or it may be needed even while the same workmen are operating the a paratus. The occasion which calls for a ustment is easily reeo nized, and with a little practice the mode 0 adjusting'is easily if the cavity or The advantages of my inventing will be up arent. It being praclicallylm 'bleto ma e the conditions the some in glass bath throughout all parts thereof I'am enabled by my invent1on to counteract and compensate for the difierencesh; I thereby not only improve the quality of the glass by -obtaining substantially uniform thickness, but I atly increase the output, reduce the cost ofiubsequent operations, and also the amount of breakage.

It will be understood that the relative adjustment between the bait and the pot may 6S8 arms are PIO- v wince tension in his different be fibtameidfleither by adj ustingbthe t latera in i erent rtions, or y a justlng' 60 the alt carrier. 'l lie adjustments ma be carried out in many difierent ways wit out de arting from m invention, since I consid r in self the rat to rovide adjustin means or shifting the re ative position 0 the bait and receptacle.

- I claim 1. In glass drawi apparatus, a glassholding receptacle, an a bait or drawing device, one of said parts bein adjustable relative to the other in a latera direction; substantially as described.

2. In glass drawi a paratus I. glass holding receptacle, an a raw" device,the drawing device being adjust lfie laterally relative to the pot; substantially as described.

3. In glass drawing ap aratus, a glassholding recc tacle, a halt, a ait support, and mechanism or adjustingsaid support laterally in diflerent directions; substantially as described.

4. In glass drawing apparatus, holding ot, a bait, and a bait sup rt, said su port being adjustably mounte to \i e for adjustments in different later directions relative to the receptacle; substantially as described.

5. The method of drawing glass of substan tially uniform thicknem, eonsi in adjusting the point of draw relative to the wall of the pot to compensate for va ing conditions in the lass of the bath; substan tially as described? v 6. The method of drawing hollow l'ass articles of substantially uniform wall t '61:- uess, oonsistin in ad usting the iston of the bait latera y relatlve'to the wa ls of the pot to compensate for varying conditions in the glass bath, and then drawing the hollow glass article from said bath; substantiallyas described. y

7. The method of ,drawing glass of substantially uniform thickness from amolten' glass bath, consisti in adjustin the pointof draw to provide orsulbqtantial y uniform parts of the icie being drawn; substantially as de scribed.)

In testimony whereof, I have hereunto set 1 0 my hand.

a glass- JOHN H. Lnnnnas.

Witnesses Joan Minna, H. M. Conwnv. 

